ios项目中，用到了Alamofire的JSONEncoding去实现参数的json格式化
结果出错：
swift:140] collectionView(_:numberOfItemsInSection:) > curCount=1 2017-10-12 16:11:14.245 [Verbose] [main] [ManageImageTableViewCell.swift:146] collectionView(_:cellForItemAt:) > collectionView=<UICollectionView: 0x7fd4899d3200; frame = (0 0; 375 74.5); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x604000a45f70>; layer = <CALayer: 0x604000839aa0>; contentOffset: {0, 0}; contentSize: {375, 66}; adjustedContentInset: {0, 0, 0, 0}> collection view layout: <UICollectionViewFlowLayout: 0x7fd48e424df0>, indexPath=[0, 0] 2017-10-12 16:11:14.248 [Debug] [main] [ThisVisitItemTableViewController.swift:294] tableView(_:cellForRowAt:) > indexPath=[2, 0] 2017-10-12 16:11:14.256 [Debug] [main] [ThisVisitItemTableViewController.swift:294] tableView(_:cellForRowAt:) > indexPath=[3, 0] 2017-10-12 16:11:15.862 [Debug] [main] [AppDelegate.swift:214] naviBackButtonPressed > sender=<UIButton: 0x7fd48e425550; frame = (0 0; 22 22); opaque = NO; layer = <CALayer: 0x604000637f20>> 2017-10-12 16:11:15.865 [Debug] [main] [AppDelegate.swift:200] navigationController(_:willShow:animated:) > curVC=<SRTDev.ShopVisitViewController: 0x7fd488e42e80> 2017-10-12 16:11:16.881 [Debug] [main] [VincentHttp.swift:31] getUrlRespJson_async(httpMethod:url:parameters:headers:requsetType:respJsonHandle:) > gCurUserItem.accessToken:Optional(“v489m85efhll5bi218tu3gc2ve”) 2017-10-12 16:11:16.881 [Debug] [main] [VincentHttp.swift:46] getUrlRespJson_async(httpMethod:url:parameters:headers:requsetType:respJsonHandle:) > currentHeaders=[“Content-Type”: “application/json; charset=UTF-8”, “authorization”: “Bearer v489m85efhll5bi218tu3gc2ve”] 2017-10-12 16:11:16.898455+0800 SRTDev[61373:4228340] dynamic_cast error 2: One or more of the following type_info’s has hidden visibility. They should all have public visibility. N10__cxxabiv116__shim_type_infoE, id, N10__cxxabiv117__pbase_type_infoE. 2017-10-12 16:11:16.898647+0800 SRTDev[61373:4228340] dynamic_cast error 2: One or more of the following type_info’s has hidden visibility. They should all have public visibility. N10__cxxabiv116__shim_type_infoE, id, N10__cxxabiv117__pbase_type_infoE. 2017-10-12 16:11:16.945545+0800 SRTDev[61373:4228340] [Bugly] Trapped uncaught exception ‘NSInvalidArgumentException’, reason: ‘Invalid type in JSON write (_SwiftValue)’ ( 0 CoreFoundation 0x000000010b17003b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010c908f41 objc_exception_throw + 48 2 CoreFoundation 0x000000010b1e4b45 +[NSException raise:format:] + 197 3 Foundation 0x000000010a375a25 _writeJSONValue + 706 4 Foundation 0x000000010a3c5084 ___writeJSONObject_block_invoke + 176 5 libswiftCore.dylib 0x000000010d7a4ca3 _T0s26_SwiftDeferredNSDictionaryC23enumerateKeysAndObjectsySi7options_ys9UnmanagedVyyXlG_AGSpys5UInt8VGtXB5usingtFTfq4dgn_n + 291 6 libswiftCore.dylib 0x000000010d5cc4b1 _T0s26_SwiftDeferredNSDictionaryC23enumerateKeysAndObjectsySi7options_ys9UnmanagedVyyXlG_AGSpys5UInt8VGtXB5usingtF + 17 7 libswiftCore.dylib 0x000000010d5cc97b _T0s26_SwiftDeferredNSDictionaryC23enumerateKeysAndObjectsySi7options_ys9UnmanagedVyyXlG_AGSpys5UInt8VGtXB5usingtFTo + 43 … 34 SRTDev 0x0000000105fc4837 main + 55 35 libdyld.dylib 0x000000010e154d81 start + 1 ) ================================================================= Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] PID: 61373, TID: 4231063, Thread name: (none), Queue name: com.tencent.bugly.operationQueue (QOS: USER_INTERACTIVE), QoS: 33 Backtrace: 4 SRTDev 0x000000010650f73d -[BLYCrashLogic jceModel] + 1703 5 SRTDev 0x00000001064fe413 -[BLYCommonUploadLogic main] + 229 … 34 SRTDev 0x0000000105fc4837 main + 55 35 libdyld.dylib 0x000000010e154d81 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) |
找到了代码的地方：
mergedExtraPara[“parameters”] = parameters as AnyObject? mergedExtraPara[“headers”] = headers as AnyObject? gLog.debug(“currentHeaders=\(curHeaders)”) var paramEncoding:ParameterEncoding = JSONEncoding.default if (httpMethod == .get) { paramEncoding = URLEncoding.default } // let curHttpReq = Alamofire.request(url, method: httpMethod, parameters: parameters, encoding: JSONEncoding.default, headers: curHeaders) let curHttpReq = Alamofire.request(url, method: httpMethod, parameters: parameters, encoding: paramEncoding, headers: curHeaders) gLog.verbose(“curHttpReq=\(curHttpReq)”) |
调用的地方：
enum TaskStatusType:Int{ case draft = 11 //草稿 case toBeFilled = 21 //待填写 case pendingApproval = 31 //待审批 case rejected = 22 //被驳回 } var parameters = [String : AnyObject]() parameters = [ “id”: self.id as AnyObject, “status”: TaskStatusType.pendingApproval as AnyObject ] self.pleaseWait() getUrlRespJson_async( httpMethod: .put, url: ServerApi.getShopVisitDetailsUrl(id:self.id), parameters: parameters, |
所以需要去搞清楚，对于Alamofire的JSONEncoding解析时，需要满足什么条件
Alamofire/Alamofire: Elegant HTTP Networking in Swift
示例代码中的：
let parameters: Parameters = [ “foo”: [1,2,3], “bar”: [ “baz”: “qux” ] ] |
参数是：Parameters的类型。
去找找这个是什么类型：
/// A dictionary of parameters to apply to a `URLRequest`. public typealias Parameters = [String : Any] |
所以，看来是需要把参数类型符合这个类型就可以了。
【总结】
此处用Alamofire参数解析JSONEncoding出错，原因是：
之前用：
var parameters = [String : AnyObject]() parameters = [ “id”: self.id as AnyObject, “status”: TaskStatusType.pendingApproval as AnyObject ] |
但是其中的TaskStatusType.pendingApproval是个enum类型：
enum TaskStatusType:Int{ case draft = 11 //草稿 case toBeFilled = 21 //待填写 case pendingApproval = 31 //待审批 } |
而不是普通的类型
改为enum的rawValue，即Int：
“status”: TaskStatusType.pendingApproval.rawValue |
即可：
调试效果：
TaskStatusType.pendingApproval.rawValue可以获得Int的值31了：
然后：
let curHttpReq = Alamofire.request(url, method: httpMethod, parameters: parameters, encoding: paramEncoding, headers: curHeaders) |
即可正常运行，可以格式化参数为json字符串了。